The real knockout of the UFC 205 championship was Demi Lovato. Stepping out in sleek style on Saturday, the pop star made her way into the Big Apple’s Madison Square Garden arena wearing a strapless black dress and matching stiletto pumps.

Though a blazer was draped over her shoulders, her best accessory of the night was her date — mixed martial arts fighter Luke Rockhold, who was a dapper companion in a black suit and matching monk strap shoes.

Skechers ambassador Lovato and Adidas-sponsored Rockhold were among the many boldface names in the crowd eager to see the UFC 205 tournament, which yielded a historic victory for Conor McGregor. He became the first fighter in the organization to hold two simultaneous titles after defeating Eddie Alvarez in the featherweight championship. McGregor already triumphed in the welterweight championship in August after upending Nate Diaz.

Reebok took to Twitter to praise McGregor, who joined its stable of athletes last year. “History’s been made tonight,” the sportswear brand tweeted. “@TheNotoriousMMA: Two-weight @UFC world champion! Hold those belts up high! #extragold #UFC205 #UFCNYC”

Elsewhere in the star-studded arena, Madonna, Hugh Jackman and Zac Efron snapped selfies with each other, and Bella Hadid also gave spectators a reason to look at something other than the octagon cage: She arrived in a see-through blouse that exposed her bra. The supermodel completed the sizzling look with a black leather jacket, lace-up jeans and a pair of towering Versace booties that featured a gold platform.